chemistry
posted by dave .
Consider a red flame color produced by excited lithium with a wavelength of 671 nm. What is the mass equivalent of 1 mol of photons of this wavelength?
I can get as far as Js of E
Can't seem to find equation to turn Js into mols, or photons into mols, for Js into photons.
I'm lost

E=h*c/lambda Solve for E, the energy in one photon, then multily it by avagradros number.

ahh, of course, thank you.